#include <iostream>

double astroUnits(double);

int main()
{
    using namespace std;
    double lightYears;
    cout << "Enter the number of light years: ";
    cin >> lightYears;
    cout << lightYears << " light years = " << astroUnits(lightYears) << " astronomical units.";
    return 0;
}

double astroUnits(double lightYears)
{
    return lightYears * 63240;
}
